<!DOCTYPE HTML>
<style>
body {
    margin: 0;
}
.other {
    width: 20px;
    height: 20px;
    background-color: blue;
    display: inline-block;
}
#target {
    width: 100px;
    height: 100px;
    background-color: green;
    display: inline-block;
    vertical-align: 50px;
}
</style>
<div class="other"></div><div id="target"></div><div class="other"></div>
